v3.26.1
Intangible Assets - Narrative (Details)
 12 Months Ended 22 Months Ended
Mar. 31, 2026
USD ($)
county
Mar. 31, 2025
USD ($)
county
Mar. 31, 2026
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]      
Impairment charges $ 0 $ 0  
Broadband licenses granted, number of counties | county 219 67  
Licenses received $ 139,608,000 $ 27,030,000  
Licenses exchanged (34,189,000) (4,231,000)  
Payments to acquire intangible assets 27,172,000 18,095,000  
Reduction of contingent liability (6,195,000) (5,999,000)  
Gain on sale of intangible assets 34,780,000 18,294,000  
Wireless Licenses      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Licenses received 139,600,000 27,000,000.0  
Licenses exchanged $ (34,200,000) $ (4,200,000)  
Wireless Licenses | Lower Colorado River Authority      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Broadband licenses granted, number of counties | county 64    
Broadband licenses transferred, total consideration $ 29,500,000    
Payments to acquire intangible assets 14,100,000    
Reduction of contingent liability 15,400,000    
Reduction in indefinite-lived intangible assets 16,600,000    
Gain on sale of intangible assets $ (12,800,000)    
Wireless Licenses | Oncor      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Broadband licenses granted, number of counties | county 91 4  
Broadband licenses transferred, total consideration $ 59,700,000 $ 40,900,000  
Payments to acquire intangible assets 53,700,000 34,000,000.0  
Reduction in indefinite-lived intangible assets 37,700,000 22,600,000  
Previously received, amount   4,000,000.0  
Deposits   10,000,000.0  
Reimbursable clearing costs and anti windfall payments 6,000,000.0 2,900,000 $ 7,500,000
Gain on sale of intangible assets $ (22,000,000.0) $ 18,300,000